Hi there, I am currently pregnant but wish to find out conception dates due to 2 potential fathers. - My due date on US in Week 6 & Week 12 is both 29/7/2015. - My LMP is 15 Septemeber 2014. However I missed my period in October, November and December. I had periods from Jan-Sept 2014. - In mid-October I tested negative for pregnancy test. On 22 November I tested positive. - On 12 November I noticed 2 drops of blood (not period) on underwear. No other bleeding after that. Is due date by US before Week 12 ( and hence, conception date) more accurate than due date by LMP? Doctors believe I did not ovulate in October 2014 due to stress. What possible dates did I conceive?